Considering Sammy's "girlfriend" can lick Sammy's arsehole while pregnant with her brothers baby and Sammy being pregnant from who knows who, I think we are long past that point.
Does "girlfriend's" pregnancy happen while she's MC's "girlfriend" and not at MC's request? You might want to update the tag list with
netorare
in such case. If it is at MC's request and/or consent then it'd probably fall under
sharing
.
You're right this ship has sailed in such case, but it doesn't mean some people who find themselves at empty pier without any warning ain't going to be upset about it.
Also, there is no such thing as a "LI" in this game.
It's just a convenient shorthand. There's no real use in splitting hair whether the person MC has sex with is a casual hookup, friend with benefits or whatever else they might be viewed as.